Internal combustion engine



Jan. 5, H R. SETZ INTERNAL COMBUSTION ENGINE Filed nec. 15, 1925 Patented dan. 5, 1932 narran STATES PATENT' ferries HANS SETZ, DEcEAsED, LATE or HIGHLAND PARK, PENNSYLVANIA, BY BERTIIA E. sErz, AnMINIsrnATRIX, .oF HIGHLAND PARK, PENNSYLVANIA INTERNAL coIvIBusTroN ENGINE Application led December 15, 1925. Serial No. 75,505.

rlhe invention relates to an improvement in internal combustion engines, and more particularly to engines of the Diesel type op ever, open to serious objection in that some sort of valve and control is necessary for the auxiliary port in order to prevent induction into the Cylinder of exhaust gases at the end of the suction stroke when the auxiliary port Y is uncovered by the piston. The necessity for valve and control substantially overbalances the advantages of the auxiliary port and deters its more frequent application.

Now it is the object of the invention to provide means whereby the auxiliary exhaust port may be utilized without the necessity for any valve or control other than thatexercised by the enoine piston, and at the same time malte possi le an increase in the powerV output of an engine embodying the invention.

Having now indicated, in a general way, the nature, purpose and advantage of the invention, a detailed description thereof follows with reference to the. accompanying' drawing in which has been illustrated a preferred embodiment and in which* The ligure is a diagrammatic view of an engine cylinder embodying the invention.

a represents an engine cylinder, Within which is adapted to work a piston Z9, the piston being illustrated in its lower dead center position. So positioned in the cylinder as to be completely uncovered when the piston is in lower dead center position is an auxiliary exhaust port g.

The cylinder head is provided with an eX haust port leading to a passage f and controlled by means of a mechanically operated valve e, with an auxiliary air admissionport Communicating with a passage c and controlled by a valve d, and with a suitable fuel injection valve j. y

ln the cylinder head there is also provided a port communicatingwith a passage leading to a compressor z', and controlled by a; mechanically operated admission valve fr 0perated from the engine or by external power,'

. as desired.V y

lt will be noted that the exhaustpassage f" and the auxiliary exhaust port'g are in communication with atmosphere while the valve L, contraryto usual practice, controls the ad mission to the cylinder of slightly precompressed an'. The anxihary air admission passage c is in communication with atmosk pliere, but the valve Z comes into action only when the compressor c' is'out of operation. The valve l may be operated mechanically or by the suction of the piston when air is not admitted through valve h. v

ln the operation of the engine, the piston, in its expansion stroke7 uncovers the auxiliary port g for sueient time to permit the gas pressure inthe cylinder to-drop practically to atmospheric before the exhaust valve e opens. The exhaust valve e opens as the piston starts the exhaust stroke and is timed to remain open during the entireexhaust stroke so as to permit the piston to expel the spent gases from the cylinder. `Shortly bei fore the piston reaches upper dead center, the valve It opens and admits precompressed airsupplied by compressor z', which sweeps any remaining spent gas out of the cylinder through the exhaust port, the valve e being open.l ,c f

As the piston starts down on the suction stroke, the exhaust valve closes, but the valve z, remains open during the entire stroke so that the cylinder is filled with a fresh charge of air at pressure sufficiently higher than atmosphere, so that when the auxiliary exhaust port g is uncovered by the piston the air in the cylinder will blow out through the port and prevent any induction of spent gases.

The introduction of precompressed air as will be noted effectively increases the density of the air in the cylinder and obviates the necessity for any valve or controlk of theV auxiliary exhaust port by effectively preventbodiment shown and described, since it is capable of various applications Without departing from the spirit thereof.

Having now fully described the invention, what is claimed is l l. yA four cycle engine comprising a cylinder, a piston in said cylinder, an exhaust port in the cylinder' arranged tobe uncovered by the piston during the latter portion of its outward stroke, and means for introducing air above atmospheric pressure into the cylinder during vsubstantially the entire suction stroke and during the initial portion of the compression stroke.

2., The method of Aoperating a four cycle vinternal combustion engine comprising a cylinder, a piston in said cylinder, and an exhaust port uncovered by the piston during the latter part of its outward stroke, including introducing air at greater than atmospheric pressure during substantially the entire suction stroke and during the initialportion of the compression stroke.

3, The method of operating a four cycle internal combustion engine comprising a cylinder, a piston in said cylinder,'and an exhaust port uncovered by the piston during the latter part of its outward stroke, including introducing air at greater than atmospheric pressure during substantially theentire suction stroke and during the initial portion of the compression stroke, and introducing fuel during the compression stroke subsequently to the closure of the exhaust port.

4. The method of operating a tour cycle internal combustion engine comprising a cylinder, a piston in said cylinder, an exhaust port uncovered by the piston during the latter' part of its outward stroke, and a second exhaust port opened at the beginning of the exhaust stroke of the piston, including introducing air at greater than atmospheric pressure at the end of the exhaust stroke of the piston, during the suction stroke, and during the initial portion of the compression stroke, and introducing fuel during the compression stroke subsequently to the closure oit the first mentioned exhaust port.

5.' A four cycle engine comprising a cylinder, a piston in said cylinder, a fuel intake, an exhaust port inthe cylinder arranged to be uncovered by the piston during the latter part of its outward stroke, means for introducing air above atmospheric pressure into the cylinder during the latter part of the exhaust stroke, during the suction stroke, and during the initial portion of the compression stroke, and means for introducing fuel dur ing the compression stroke subsequently to the closure of the exhaust port.

6. A four cycle engine comprising a cylinder, a'piston in said cylinder, a fuel intake, an exhaust port in the cylinder arranged to beL uncovered by the piston during the latter part of its outward stroke, a second exhaust port arranged to be opened at the beginning of the exhaust stroke of the piston, means for introducing air above atmospheric pressure into the cylinder during the latter part of the exhaust stroke, during the suction stroke, and during the initial portion of the compressionstroke, and means for introdue ing fuel during the compression stroke sub sequently to the closure of the irstmentioned exhaust port(V Y In testimony of which invention, have hereunto set my hand, at Philadelpl1ia,le1m sylvania, on this le'lth day of December, 1925.

BERTI-IA E. SETZ, Administra/'727m o the Estate of Hans R. Setz,

Dec/weed.V 

